ios - Best place to set cornerRadius based on UIButton size in subclass? -

so having few different rounded buttons within app (all way circular buttons), , can tell, easiest way achieve set cornerradius property of buttons calayer.

however, don't want doing manually every button requires in every controller, thought simple subclass sets on init way.

i using storyboard , autolayout position , size buttons, , assigning them subclass.

class roundedbutton: uibutton {      required init(coder adecoder: nscoder) {         super.init(coder: adecoder)         self.layer.cornerradius = self.bounds.size.height / 2.0         self.clipstobounds = true         nslog("button bounds: h-%f  w-%f", self.bounds.size.height, self.bounds.size.width)         nslog("button frame: h-%f  w-%f", self.frame.height, self.frame.width)     } } 

but have come find out @ point (i.e. init), size of neither frame nor bounds final. button in storyboard sized (and constrained) h40 x w40, bounds/frame sizes showing h30 x w38.

this means cornerradius doesn't value expect.

i have confirmed @ later point (e.g. when button can respond tap) frame/bounds indeed h40 x w40.

so after that, question is, within uibutton subclass, when/where can safely set cornerradius using final frame/bounds values of instance?

if want code executed after view has gone through autolayout must in layoutsubviews after calling super.layoutsubviews().

like :

class roundedbutton: uibutton {      override func layoutsubviews() {         super.layoutsubviews()          layer.cornerradius = bounds.size.height / 2.0         clipstobounds = true     } } 

this code not perfect though because doesn't support when height bigger width (easy fix though…).